Choose the grammatically correct sentence:

Question

Accepted Answer

Option 2, "No sooner did we reach the station than the train arrived," is grammatically correct because it follows the correct structure for the "no sooner...than" correlative conjunction.

Here's why:

*   **Inversion after "No sooner":** When "no sooner" begins a sentence, it requires inversion of the subject and auxiliary verb. In this case, "did" (auxiliary verb) comes before "we" (subject). This is a standard grammatical rule for sentences beginning with negative adverbs like "no sooner," "hardly," "scarcely," etc.

*   **Correct use of "than":** The correlative conjunction "no sooner" is always paired with "than," not "and" or "then." "Than" is used to introduce the second event that happened immediately after the first.

Now, let's examine why the other options are incorrect:

*   **Option 1: "No sooner we reached the station and the train arrived."** This is incorrect because it lacks the necessary inversion after "no sooner" and uses "and" instead of "than." The correct structure requires the auxiliary verb "did" before the subject "we," and "than" to connect the two clauses.

*   **Option 3: "No sooner did we reach the station then the train arrived."** This is incorrect because it uses "then" instead of "than." "Then" indicates a sequence in time, but "than" is the correct correlative conjunction to use with "no sooner" to indicate that one event happened immediately after the other.

*   **Option 4: "No sooner did we reach the station the train arrived."** This is incorrect because it is missing the conjunction "than" altogether. The sentence needs a conjunction to properly connect the two clauses and express the relationship between the two events. The "no sooner...than" structure is incomplete without the "than."

Therefore, only Option 2 correctly uses the "no sooner...than" structure with the required inversion and the correct conjunction, making it the grammatically correct sentence.